NanaZip is an open source file archive. From 5.0.1252.0 to before 6.0.1698.0, a null-pointer dereference exists in the UFS/UFS2 filesystem image parser in NanaZip. The vulnerability is triggered when opening a crafted UFS image where the root inode (inode 2) is set to IFLNK (symlink) instead of IFDIR (directory). The parser unconditionally treats the root inode as a directory without checking its type, and when the symlink has an embedded target (small di_size), the directory data buffer is zero-length, causing a null-pointer dereference on the first read. This vulnerability is fixed in 6.0.1698.0.
History

Mon, 18 May 2026 14:00:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:m2team:nanazip:*:*:*:*:*:*:*:*

Wed, 13 May 2026 16:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 12 May 2026 22:30:00 +0000

Type Values Removed Values Added
First Time appeared M2team
M2team nanazip
Vendors & Products M2team
M2team nanazip

Tue, 12 May 2026 19:30:00 +0000

Type Values Removed Values Added
Description NanaZip is an open source file archive. From 5.0.1252.0 to before 6.0.1698.0, a null-pointer dereference exists in the UFS/UFS2 filesystem image parser in NanaZip. The vulnerability is triggered when opening a crafted UFS image where the root inode (inode 2) is set to IFLNK (symlink) instead of IFDIR (directory). The parser unconditionally treats the root inode as a directory without checking its type, and when the symlink has an embedded target (small di_size), the directory data buffer is zero-length, causing a null-pointer dereference on the first read. This vulnerability is fixed in 6.0.1698.0.
Title NanaZip: Null-pointer dereference in NanaZip UFS parser when root inode is a symlink
Weaknesses CWE-476
References
Metrics cvssV3_1

{'score': 3.3, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-05-12T19:21:04.924Z

Updated: 2026-05-13T14:43:33.505Z

Reserved: 2026-04-27T13:55:58.692Z

Link: CVE-2026-42442

cve-icon Vulnrichment

Updated: 2026-05-13T14:43:22.836Z

cve-icon NVD

Status : Analyzed

Published: 2026-05-12T20:16:41.393

Modified: 2026-05-18T13:51:59.763

Link: CVE-2026-42442

cve-icon Redhat

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